[600MRG] Loading Coil with a Tuning Disc in the center

[Edward R Cole]

Hmm.  If you short a turn the coil is shorter and has less 
resistance.  If you lower-Q that is good.  My antenna Q is so high, 
bandwidth is only 5-6 kHz.  I fattened my antenna to lower Q.

Can any ham actually measure the effect of a tuning loop inside a 
coil?  I mean efficiency.  How is a variometer any different in effects?

73, Ed - KL7UW

At 08:47 AM 5/7/2018, J Mcvey via 600MRG wrote:
>OK, but a shorted turn will also reduce the overall Q as well.
>It will also sap energy.
>I think we don't see this method in newer stuff for good reason...
>
>
>On Monday, May 7, 2018, 12:00:25 PM EDT, Kenneth G. Gordon 
><kgordon2006 at frontier.com> wrote:
>
>
>On 7 May 2018 at 14:11, J Mcvey via 600MRG wrote:
>
> > I have some similar devices that can be found in old BC-375 tuning units.
> > I wonder about the efficiency of that setup though,
> > What about the circulating currents that would set up in the 
> disk? Wouldn't that
> > act like a shorted turn?
>
>That, in fact, is the whole point. National used a similar device, a 
>shorted turn, in the coils
>for the HRO to enable adjustment of the inductance to aid in tracking.
>
>Ken W7EKB
>
>---
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com 
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